Opportunity creation with Quote - Webservice

Hi Gurus,

I have tried to create the Opportunity with Quote using 'SWIOpportunityServices' webservice. But I recieved the below error

"As determined by the first instance, all subsequent instances of integration component 'Opportunity' should use the same user key 'Implicit user key (Id) for UI Data Adapter'(SBL-EAI-04404)"

My Sample Request:

<data:ListOfSwiopportunityio>

            <data:Opportunity operation="insert">

               <data:Description>Oppty Integration</data:Description>              

               <data:Name>IMARKIA Oppty from SOAP UI</data:Name>

               <data:ListOfQuote>                 

                  <data:Quote2>

                     <data:Name2>Quote</data:Name2>

                     <data:QuoteNumber>12345</data:QuoteNumber>                    

                  </data:Quote2>

               </data:ListOfQuote>

            </data:Opportunity>

         </data:ListOfSwiopportunityio>

Can someone share a sample request XML?